Concrete for cast-in-situ pile and preparation method thereof

Abstract

The invention discloses a concrete for a cast-in-place pile, and a preparation method thereof. The concrete comprises cement, sands, pebbles, an anticorrosion and antirust agent, a flocculating agent,a water reducing agent and water. The preparation method comprises the following steps: (1) mixing hydroxymethyl cellulose, polyacrylamide, chitosan, calcium nitrite, fly ash, calcium oxide, cyclodextrine and the water reducing agent with diatomite, grinding the obtained mixture to obtain a premixed powder, and mixing sodium silicate with water to prepare an aqueous sodium silicate solution; (2)mixing 1 / 3 to 2 / 3 of the premixed powder obtained in step (1) with the cement, sands and pebbles, and mixing with the remaining water to obtain a mixture I; and (3) adding 1 / 3 to 2 / 3 of the premixed powder obtained in step (1) and the aqueous sodium silicate solution into the mixture I obtained in step (2), and continuously stirring to obtain the concrete for the cast-in-place pile. The concrete for the cast-in-place pile has the advantages of good workability, good corrosion resistance, good dispersion resistance, high strength, and suitableness for underwater cast-in-place construction.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to concrete for cast-in-place piles and a preparation method thereof. Background technique [0002] Sulfate attack has become an important factor affecting the durability of concrete structures. In recent years, in highway, railway, mine construction, underground civil air defense project, bridge foundation, tunnel lining, subway tunnel segment, hydropower project, such as Liujiaxia Hydropower Station, Bapanxia Hydropower Station in the middle and upper reaches of the Yellow River, Qinghai Chaoyang Hydropower Station and some electric power irrigation projects Severe sulphate attack has been found in concrete projects such as cement, seaports and airports. Due to the deterioration of material properties, the structure was withdrawn from service before reaching the designed service life, resulting in great waste. Especially for pile-based cast-in-situ pile concrete pro...

AI Technical Summary

Problems solved by technology

[0008] At present, the concrete poured by the existing underwater pouring method needs to be upgraded to avoid the strength loss caused by underwater dispersion. At the same time, there may be compatibility problems between other admixtures such as rust inhibitors and flocculants, which affect the concrete The workability of the concrete reduces the working performance of the concrete

With the development of my country's infrastructure, the demand for high-quality concrete is increasing, but the current material formula and construction technology have not yet met the requirements

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